User guide

Hard Drive Arrays E-11
Table E-2
Data Striping Options
Fault Tolerance Level Stripe Sizes (in sectors)
RAID 0
16, 32, 64, 128, 256, 512
RAID 1
16, 32, 64, 128, 256, 512
RAID 4
16, 32, 64, 128
RAID 5
16, 32, 64, 128
For example, consider an operating system that typically requests data in
32-sector blocks. The array controller distributes the data so that the first 32
sectors of data are on the first drive in the array. The array controller continues
distributing the next 32 sectors on the second drive, the next 32 sectors on the
third drive, and so on. Evenly distributed user data across all drives in an array
results in improved performance by allowing data access to all drives
simultaneously.
DATADATADATADATA
Daz-9-11.EPS
4
8
3
7
2
6
1
5
9
4
8
3
7
2
6
1
5
9
4
8
3
7
2
6
1
5
9
4
8
3
7
2
6
1
5
9
Figure E-8. Data striping distributes data across all physical drives
Array Accelerator
By serving as a posted write cache and read-ahead cache, the array accelerator
dramatically improves the performance of read and write commands. The
array accelerator is particularly useful for increasing performance in database
and fault tolerant configurations.